I tried the ExtGWT Demo Explorer (http://extjs.com/explorer) and I noticed that there is a problem when restoring a tree panel that was previously minimized.

Here's what I did:
1. Open http://extjs.com/explorer;
2. Click on [<<] button in left-hand tree panel - the panel is now minimized;
3. Click on vertical bar that represents minimized panel (not the [>>] button) - the tree panel is restored but not the center panel which is now overlapped by the tree panel;

When I do steps 1 and 2 and then I click on [>>] button availoable in tree panel, the tree panel is properly restored including the center panel;

This is not a bug, rather a feature. The west panel is "floated" when you click the vertical bar. If you click anywhere on else on the screen it is hidden. Clicking on the >> while floating restores the west region.